Kylie's sisters - Kim Kardashian West, 37, Khloé Kardashian, 34, and Kendall Jenner, 22, were all there for the bash, which featured photos of fam sticking their middle fingers high to the camera.

"BIRTHDAY BEHAVIOR! WERE ALL TURNING 21", Kylie wrote in a caption of the photo on Instagram. Kylie's beau Travis Scott was also present to celebrate with the reality TV star.

"Happy 21 st birthday to my baby!" What was life before you, Stormi.

"You are truly a special soul and you have the biggest heart and you are so kind and generous and thoughtful to everyone", the message continued. You're less selfish - and I actually enjoy changing diapers.